多次感染的人很可能免疫功能有缺陷。那些打了疫苗之後感染新冠的人也可能免疫功能較弱 (如老人)。
所有跟帖:
• agree! -street0120003- ♂ (0 bytes) () 09/07/2021 postreply 09:53:44
• agree! -street0120003- ♂ (0 bytes) () 09/07/2021 postreply 09:53:44
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